i'm not entirely clear on the exact details of what went down between him and the other dude, but one of his characters forced himself upon another's without the user's permission. Alongside that, people got fed up with his tendency to not ask for permission before killing, one-shotting people, being a general all-around prick, and creating characters that were so broken that you'd think they were the main character of an anime. I myself didn't have much to do with the whole matter as I hadn't interacted with him but once in a separate RP, but from what interactions I've seen him in and how he handles himself with other people, I find the reputation he's gotten quite fitting.